logs of my work and digital life
C#
C# Parent Child Reference Variable & Object Casting
Jan 25th
I have been clearing my concepts regarding inheritance and investigating if parent reference variable can point to child class object and vice versa.
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.Generic;
using System.Text;
namespace oops
{
public class A
{
public A()
{
Console.WriteLine("A");
Console.WriteLine("===============================");
}
public void Add()
{
Console.WriteLine("Add");
}
}
public class B : A
{
public B()
{
Console.WriteLine("B");
Console.WriteLine("===============================");
}
public void Sub()
{
Console.WriteLine("Sub");
}
}
class Program
{
static void Main(string[] args)
{
A objA = new A();
B objB = objA as B;
A objAB = new B();
B objBB = objAB as B;
objBB.Sub();
if (objB is B)
{
objB.Add();
}
else
{
Console.WriteLine("objB is not B");
}
//objA.Add();
Console.ReadLine();
}
}
}
Out put of the code is
A
===============================
A
===============================
B
===============================
Sub
objB is not B
Design Patterns: Iterator
Jul 8th
Hi Guys,
I am reading more on design patterns from this article after little theory session here is working code. Key point was all of the collection classes in the System.Collections namespace, as well as arrays, implement IEnumerable and can therefore be iterated over.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class IteratorPattern
{
static void Main(string[] args)
{
int[] values = new int[] { 1, 2, 3, 4, 5 };
IEnumerator<int> e = ((IEnumerable<int>)values).GetEnumerator();
while (e.MoveNext())
{
Console.Write(e.Current.ToString() + " ");
}
Console.ReadKey();
}
}
}
Observer pattern with .net
Jul 8th
Hi folks,
Well I am investigating design patterns by reading an article so after reading a bit I thought it would be nice if I write some code and test it.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
/// <summary>
/// Product Class
/// </summary>
public class Product
{
public delegate void NameChangeEventHandler(int a);
public event NameChangeEventHandler NameChanged;
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
if (NameChanged != null)
{
NameChanged(5);
}
}
}
public Product(string name)
{
Name = name;
}
public void PrintName()
{
Console.WriteLine("ProductName={0}", Name);
}
}
/// <summary>
/// Test Class
/// </summary>
public class Test
{
public Test(Product P)
{
P.NameChanged += new Product.NameChangeEventHandler(ChangeDetected);
}
public void ChangeDetected(int a)
{
Console.WriteLine("change found,argument passed is {0}",a);
}
}
static void Main(string[] args)
{
Product p = new Product("najam awan");
p.PrintName();
Test t = new Test(p);
p.Name = "najaf awan";
p.PrintName();
Console.ReadKey();
}
}
}
Custom Event for Classes
Jul 6th
I was reading how to write events for your custom classes so after reading a little I thought give it a shot and created this sample code. Below code is using Product class with event and delegate for event handling and other class named Test is using this class and manipulate product class data. If you change the Name of the product event will fire.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
/// <summary>
/// Product Class
/// </summary>
public class Product
{
public delegate void NameChangeEventHandler(int a);
public event NameChangeEventHandler NameChanged;
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
if (NameChanged != null)
{
NameChanged(5);
}
}
}
public Product(string name)
{
Name = name;
}
public void PrintName()
{
Console.WriteLine("ProductName={0}", Name);
}
}
/// <summary>
/// Test Class
/// </summary>
public class Test
{
public void ChangeDetected(int a)
{
Console.WriteLine("change found,argument passed is {0}",a);
}
public void TestProduct()
{
Product p = new Product("najam awan");
p.PrintName();
p.NameChanged += ChangeDetected;
p.Name = "najaf";
p.PrintName();
Console.ReadKey();
}
}
static void Main(string[] args)
{
Test t = new Test();
t.TestProduct();
}
}
}
Sql Data Srouce Control Updating Data From Database
Jul 17th
hey guyz finally we have to learn how to update our tables in database so only for you guys here is my sample code
string giftId = GridView1.SelectedRow.Cells[0].Text.ToString(); //getting an id
SqlDataSource myDbSource = new SqlDataSource();
myDbSource.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
//myDbSource.InsertCommand = “update gifts set giftActivate=1 where giftId=” + Entrydate + “)”;
myDbSource.UpdateCommand = “update gifts set giftActivate=’1′ where giftId=” + giftId;
myDbSource.ProviderName = “System.Data.SqlClient”;
myDbSource.Update();
Well this code set giftActive flag to 1 for all the rows matched with giftid value.
Sql Data Srouce Control Deleting Data From Database
Jul 17th
Hey guyz today i will show you how to fire delete query by using our beloved control sqldatasource.
Here is the code
SqlDataSource myDbSource22 = new SqlDataSource();
myDbSource22.ConnectionString = ConfigurationManager.ConnectionStrings["lalConnectionString"].ConnectionString;
myDbSource22.ProviderName = “System.Data.SqlClient”;
myDbSource22.DeleteCommand = “delete from ProductsGroups where pid = ” + productId;
myDbSource22.Delete();
All it does it deletes all the rows for a given productID from table productgroups. Simple right 
Read SMTP settings from asp.net web.config
Jul 16th
hi guyz
Sorry for writing after such a long time i guess i am very busy now a days so for a project i needed to read my smtp email settings defined in my web.config file so after some efforts i am able to read these settings direct from my system .net section.
System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
System.Net.Configuration.MailSettingsSectionGroup settings = (System.Net.Configuration.MailSettingsSectionGroup) config.GetSectionGroup("system.net/mailSettings");
Response.Write("<br>Username="+settings.Smtp.Network.UserName);
Response.Write("<br>Password=" + settings.Smtp.Network.Password);
Response.Write("<br>host=" + settings.Smtp.Network.Host);
Response.Write("<br>port=" + settings.Smtp.Network.Port);
Response.Write("<br>from=" + settings.Smtp.From);
System.Net.Configuration.MailSettingsSectionGroup settings = (System.Net.Configuration.MailSettingsSectionGroup) config.GetSectionGroup("system.net/mailSettings");
Response.Write("<br>Username="+settings.Smtp.Network.UserName);
Response.Write("<br>Password=" + settings.Smtp.Network.Password);
Response.Write("<br>host=" + settings.Smtp.Network.Host);
Response.Write("<br>port=" + settings.Smtp.Network.Port);
Response.Write("<br>from=" + settings.Smtp.From);
How to get directory name of the page currently displaying
Nov 6th
If you want to know only the directory name not the full path of the page that is currently displaying you can use this code
string sPath = System.Web.HttpContext.Current.Request.Url.AbsolutePath;
System.IO.FileInfo oInfo = new System.IO.FileInfo(sPath);
string sRet = oInfo.Directory.Name.ToString();
Response.Write(“<br><br>Directory name===” + sRet + “<br><br>”);
Happy Coding
Najam Sikander Awan
How to get pagename of itself
Nov 6th
If you want to display the filename or page name of the current displaying page just use these two lines and it will show only the filename like default.aspx, najam.aspx or indexas.aspx no matter it these pages are located deep into your site structure.
string pagename = System.IO.Path.GetFileName(Request.ServerVariables["SCRIPT_NAME"]); Response.Write(pagename);
Enjoy coding
Najam Sikander Awan
